Allosaurus ("Different Lizard") was a large carnivorous theropod dinosaur that had a set of unusually longer forelimbs compared to other large theropods. Each forelimb was completed with a set of three fingers.

It was a bipedal specimen that would reach between 8.5 meters (28 feet) long to 12 meters (39 feet) long, and the large skull of the creature was fully equipped with deadly sharpened teeth that could tear the flesh off its prey to allow for proper chewing.